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OSPF: Fix bogus LSA ID collisions between received and originated LSAs

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After restart, LSAs locally originated by the previous instance are
received from neighbors. They are installed to LSA db and flushed. If
export of a route triggers origination of a new external LSA before flush
of the received one is complete, the check in ospf_originate_lsa() causes
origination to fail (because en->nf is NULL for the old LSA and non-NULL
for the new LSA). The patch fixes this by updating the en->nf for LSAs
being flushed (as is already done for empty ones). Generally, en->nf
field deserves some better description in the code.

Thanks to Jigar Mehta for analyzing the problem.
This commit is contained in:
Ondrej Zajicek (work) 2016-03-22 12:51:31 +01:00
parent 0a505706bc
commit 39a6b19d6d
1 changed files with 1 additions and 1 deletions
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2
proto/ospf/topology.c
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@ -278,7 +278,7 @@ ospf_originate_lsa(struct ospf_proto *p, struct ospf_new_lsa *lsa)
if (!SNODE_VALID(en))
s_add_tail(&p->lsal, SNODE en);
if (en->lsa_body == NULL)
if (!en->nf || !en->lsa_body)
en->nf = lsa->nf;
if (en->nf != lsa->nf)